DATA SEGMENT AT 2000H
        ORG 0100H
        SD1 DW 428CH
        SD2 DW 5A92H
        RESULT DW 0000H
DATA ENDS

CODE SEGMENT
ASSUME DS:DATA, CS:CODE
START:  MOV AX, DATA
        MOV DS, AX

        MOV AX, SD1
        SUB AX, SD2
        MOV RESULT, AX
        MOV AH, 4CH
        INT 21H
CODE ENDS
END START
